OnlineUsersCount.php

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<?php

namespace Elgg\Controllers;

use Elgg\Database\QueryBuilder;
use Elgg\Http\ResponseBuilder;
use Elgg\Request;
use Elgg\Values;

class OnlineUsersCount {
    
    public function __invoke(Request $request) {
        $online_users_count = max(1, elgg_count_entities([
            'type' => 'user',
            'wheres' => [
                function(QueryBuilder $qb, $main_alias) {
                    return $qb->compare("{$main_alias}.last_action", '>=', Values::normalizeTimestamp('-10 minutes'), ELGG_VALUE_TIMESTAMP);
                }
            ],
        ]));
        
        return elgg_ok_response([
            'number' => $online_users_count,
            'formatted' => Values::shortFormatOutput($online_users_count),
        ]);
    }
}